Moar Inventory Layout Fixes in CSS

- fixed CSS alignment issues with long names breaking flow (stupid Cotton Candies)
- gave eggs and potions more wiggle room
- center egg and potion artwork in div, for better alignment
- centered text beneath newly centered artworks
- adjusted CSS to show full egg and potion artwork (was clipping 2px before)
- moved item labels slightly closer to artwork, for better readability (added as a separate commit, in case people don't agree)